#include "key.h"

unsigned char Key_read()
{
	unsigned char temp = 0;
	if(P3_4 == 0)temp = 1;
	if(P3_5 == 0)temp = 2;
	if(P3_6 == 0)temp = 3;
	if(P3_7 == 0)temp = 4;
	return temp;
}